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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e9412de681634ab96ba0fbde365638df0509a9bb7c4c5a3fef4337941d6f3d' 
  AND token = 'PdvlvdmIcO26iFaK3SzPYNBaE/gefG+uYeSPA8Z94WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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