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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736c6d9935a4f8aa121251a53e140b9141a9a2ce6b73a1e087af7f7d13f84445' 
  AND token = 'tD0l7WRSVcULnFjB0R2dlJorf3T/3DwQbqshn6mh24w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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