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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32880a0d6406ac2f5b5fdd6a46e69c2111325811ab2805ff5e5e3f4dce31b17' 
  AND token = 'JlNmJBfpJvNE7b3cfybxQd+nNHyq/B74Iq2w9BzmUtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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