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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c707bf5b71ff08ce37743be3615f18a2f7cc68112e36f0fd69ae9499108e987' 
  AND token = '1u5QeOaFgjb9+iFY4J4y1fo3RV1CiSSI7b1u00+mcq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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