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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebde760ac72a357ed9dd4da7b039f4aec4b1d24a708eb050920a6258ee453a6' 
  AND token = 'q7qt3edmQWs1SJc4wMEh+7JSu6I9yNqYw0PfaBCon+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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