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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0067739917e873e6aaf5a2fd67b5967b23c3f27b003b17830cfcd092948dfc9f' 
  AND token = '13stnFn/eBMjCMfdjmWTaofJgYAwR96wJfxFhuR67oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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