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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fda25444a821f9e3afcfbbacdee71d1b10ef7eb34369d0c88eb79083463a981' 
  AND token = 'JmX7XFP01wbe+COpQ96InzFb8F8Hgx6MaqBlc0ewc4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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