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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acc51eaa17200fc17b09ee4be34080d04366c105aae02b40d1db6ac44af55f6' 
  AND token = 'pROoD6Webd5gL7sR9L5ep1cMYPL8nMJbIWwZRfXkTuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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