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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fdec11828d379c852fa121554eb24c3257c5c489b90e3f977dd3fe40846e35' 
  AND token = 'ZbrURjNBrshKcqKKjgSeC0pDv2bm9jbrvHH98J6fUnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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