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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5446a72dde36969304988702e9b116c20f4470a4caecc87b8152ecaafff06d' 
  AND token = 'NGGNS9xBiJu2yYVf0/qGRo73VQJIHO3sZmuEtmgDxyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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