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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bafcb1674181631534a93d208e0fc476388bf404fab952ac942cc7f46583a63' 
  AND token = 'CvV7065fbmi726v4vd162PTcWa2jpF4Vht8se6T/cm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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