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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d708e59372eee2fcbc39d9dfdefa183bca6963fca6af4e99f0970f2b338c9e0' 
  AND token = '8kFDCbGmRkeh2cBjVCCS5uF2tDtjCHU+0VE9FtebCKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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