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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a412ad4e9948306900314f1e7d24235a9d1717566c1da0c6f89ebf41ef516e' 
  AND token = 'qB1YbfZF5vdhwYVlTuR3en4sAqf6cIBASgAJUyePZXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}