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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f38eb470a4b186d209cbba5145f6d01f4386f56a4cd7c7057c9b60cd4dc6ad5' 
  AND token = 'fpav7ekKt4kcbzrz2pusgW11IHjI5gli8mPYJhd1Dr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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