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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6777974511f72b438046a0e526133fdbd2c1566bc238cedf000ede77e61cdc76' 
  AND token = 'hkJDK0/WneS4BI0pUlV6cfBXX+Yk3Dqd+to6E+am78k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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