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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3d9647a6d810e1f0cf5f8dfae3df51d2ce420309607acaf967dfeb40ad7075' 
  AND token = 'A98e1aj9BcN3x5jAvXjRg29sVQE4/ML3DaNB+OTt1ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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