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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d93fb01ab0294096b5d72602e819339882fe6aa7f44ca33e65901e2a5b28793' 
  AND token = 'qcEWkvStQHck9iJtgS3QZupAGJE6v1egkEi95HdCZ8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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