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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcd46f455288e95ea4aac0612dccec5d3272e0663580ec4bb332e1dc590ca44' 
  AND token = 'N5JIqgLOVCVc6eZyiYsaTVMViirZ0EA6B3vh6NhMMlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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