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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0ad5e17d49d3fea1707cfbd878fbd01be5df9b3673163bd8b6bbd8db68019a' 
  AND token = 'R1LKVPWwxS7bWc7xfbAPgw5kQQ1Yfsf4Dyp/ZtVAlJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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