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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09da3a691e15a4770d9241f39f1fa96e7506507247974c6e70c31a43f6e1dfc' 
  AND token = 'b7jdvJqIjP+239pxHySVrngW3H105emZmPQfYFgaFj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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