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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d43e05794127e80969a3817b4d0da721e85ca1a9a84583340c13b0eeadcbc8' 
  AND token = 'VAgtoD2ej51d9hzq3DIfJY23cY77oO9Y3Cta0eWqyDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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