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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdef49313abcd46ee39b459381f5efe945045aec9ab2c8665b6fb850c7d12d4' 
  AND token = '+utedkACjdfAHE5EuskJvfxjVkQL4vK5YNZxZ0wizYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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