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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb569dcf8b321b7171284a07e067022e02188114a951b0e1835fbea6f1eeaea' 
  AND token = 'MJELwC7Imphd0LVyOSBUWEWMWi/tOg4KXUrE8oYULwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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