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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e660c897859dfd97eceb8da121e63dd89bc581c08695b121929cacd00ff08863' 
  AND token = 'A2X4cRJcyzAnKIfZZnQBaiYR/yp4qU6OXg6asKPUIlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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