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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f79df8374c3d976890b7a9bcf12055a107f8bdc1a2c7e7f87a2574e576e31c2' 
  AND token = 'rQAkfCIGekK+jYMEruy+tY5BbsUWpOgkLb9g9jZSylM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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