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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82638851dedb4622986f272c4ef5879e955a825b6f971359c23c2d4c92ec43ce' 
  AND token = '0lZ1nzwIHtLFwcVT+1QKtECI0mKCC9nZXgXXE1EeA5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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