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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d5226fa23e1cabc5e6ef78a933f8e5bda0fcbb1a396c1fce3f5e2b15d1ab67' 
  AND token = 'b93+Q+k7EAWjx60DmaWGlJp/rWugYUKVLSHsFSD7UbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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