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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31605da8ce3e3f3fb81546f14b954f323b3b896cb4b9fecaed5f07c0650e36e2' 
  AND token = 'X+NhKjjQm/SQ/viAdoC6ZZTsbPZ8FcSPWixNPpwcsIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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