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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1306d962fd6fd40294ce0a449b140fe540f08934ab86a169b407b8ee8bde8729' 
  AND token = 'H3Nh4TxhNevtwtBvD5qAXsiRAzNvzNATF45Dpo99UW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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