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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a447990b80d989a6aefcfe3ba960dfb793d97fa67c95de48a0e2a9e389cb8f' 
  AND token = 'YAT5jhdND0iph9p/QooWzM5RoVnLRgZV9T0+CuZ9jpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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