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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20838537a8b8c9c68e42e33ee4eb953cd99c4c67ecd2e443ab438b1f54161cab' 
  AND token = 'lH03aFSP7zl0njDjUwe2rEUZBCkZ8fhOACdeQmr7UFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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