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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c48ccaf41731aafa2bb93cf7da356379ca0e1afd93bae6da9c6c7195c63ecf4' 
  AND token = 'YnqCh4uscI3Pnju0gBvShK9mnoviTbzK7IMwmP74HNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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