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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1eeb0020c3b7f8d6433434caf3df0350c2d26c6db0f339c545d6fa53a4def8' 
  AND token = 'JNTZE7Siu26/njPHqKmvGHxl2A5AHTm7dJvbjstqrbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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