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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63ad895ce0cfd88fed16ccb0205655fe0f7accfc9340161a1c8c2c4afed9b1f' 
  AND token = '59pDa/RdMSvddl6MSP6JIPlgIQ8AME0Wy+JR9iPt8HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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