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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014c9176d2eef5fb573e0a7e83dc75d113b92baa09a77c56ac513d7920862e9e' 
  AND token = 'NjA49q2xHku/lj1Zjd4sUl0Jup+ItfjhhXksrTGHA0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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