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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ca8fa9e53cbd3997d654f3b434e2247d6c7f5031176e8f93acb6ace19131ac' 
  AND token = 'ZZyryNepCAbcLae9TRL7AyWn+zODn0gfaJPnuhVyld8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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