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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1659c24ae85fa4eabb623e8db21a628dfffb7958a15cae24c44ef373714d98b8' 
  AND token = '/dU57+kM0PiGLD+TsrHjfKd3vAv0bXvCnm1ozNy9GeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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