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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91f980dd43c63e99e8096a1c59ee7107dc35c814db8e572ceb6a821a394e463' 
  AND token = 'X0den2kFersiWirfWOXrKygZzfkmyV7ofcHjpT4hVgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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