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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb22150f5977c9d8f489155297a2881adc3c12f6e06ec1ac157d93083efc68da' 
  AND token = 'VGfo+qqr701qXPr5eHHunMWcE7ZAR/fnLSfoQiJB6Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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