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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4796d908222b28edbd6628587ceb93bb40639d233a17acdf7ce3b31d080b198' 
  AND token = 'q3b9Hyot5m2MsAX1+Wmg55bsh93gWGB2zZBVXb1bMDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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