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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f4aa59a38ff60ba82f008ff3e7447323b461128de4f689ee8f3f3c2cdc539a' 
  AND token = 'llBvKDI3DCCb+XLRnsE8s8P6l+d8XhNovek1ZQM0mqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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