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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7e032f53c41c535c8eaa7d5ca8a4d2273d78272bf9738728a34c6bc4d3d988' 
  AND token = 'nudgh470ExJVWVcj1mUr4At2lPCCAOK15+zUqCNzuf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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