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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9680df1bbf93a037bebdd0a39521afbb619cfb158bfd4b0a62c27b67d63710b' 
  AND token = 'zbeQ17ekl6VwV70NGtlaAMOjq8SiebWt/L6TFib89tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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