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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14dae7f03f4b668c087d099ad2af24433d80b6fca79b302a9c8088baddc88c1b' 
  AND token = 'Dwu2V5iKUJA5kjk7dnrIyX2PeDb21E2tdtF3wN2oY1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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