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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24950fe8e2f043ffdba99950a5e4ea9afe735ec5ef87bda0dc23a71c250f6716' 
  AND token = 'aUIbEak4X4YtyNi59EO1wnlOiwpbQPJGsTy208xtF2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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