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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec5a928735d9f381457ca9cb4b23c1b6f9cb49b70a4e6dcbbded5b95fdb00d0' 
  AND token = '1nlybbNml7U1l2/gNei9CsYB6qiYC8YADHq70vCzNlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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