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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b022474e45bc59062b64f8e37825e2883b59b52e509102a56acc0664d977081' 
  AND token = 'wfX8URXdtMzFXWMovk+zb9zC3c+haDa+Kl29PYwAp7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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