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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3847ff7ebeafd5918be0b72fab5d8ebb2913e4053f1ae4c1c00eaa01cd9bbee' 
  AND token = 'bP87V5OLcAL+WxcGEY/G6kv9i6gFF6lmSenZsNSLF1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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