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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836912b7ac33e1996db26ffff529a97e0c111cdae3955f38f0ab34595f056593' 
  AND token = 'NuhFA6reP4J10tA8vx+3laSFrfxeKwF/DTyKckPEct4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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