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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fdf93c021f918d9d6e1853b4ab713b9165ad0ea0ce9ff75d2f7c946a15431b' 
  AND token = 'l7/DDiehN72nGemJdsGEQE3/gcFx/Tq7W42kyEHKRMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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