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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df77ec3773c933b2e82ce8671701fce8498c3481d9c85cccce9a904152c4e741' 
  AND token = 'CEC8pLjpXFUgfCcEw4EqPLUeZDBHVcGiskPWhQK9K+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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