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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28add43c73f60825ad30a40366f2e76afe1b7cfd19156750afd9c9c15918d1aa' 
  AND token = 'H8jvl6dC3F6OrxJ6O3+2PGZ91lIHifK72999o4w+XBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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