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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829a1c7da88c7bb133bf655633316841b6bcecf513bf5ef21515b69566f6dd5c' 
  AND token = 'sJ4Ie9awvEPAVutPW39w8w+c1Bl/PqcfDbWjfN7k/Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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