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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd177474a5d047317611b3241960f12a761224997a4e10c0f1e20b98ffc774a' 
  AND token = 'l5JxCdZ3mnbPEvV9Cz6QUiPDe3q6b4rTE7b83UytgTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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