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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a7c3a29f98a5d76fe2a4ebf8000d6cffeb81fcaaaae4e74441e9fc32ff3078' 
  AND token = 'i18BU3V23fEGr47F0oDfNvK7U0h5x8B17yADaiZbiDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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