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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97383d7a65a044d5b980eab549508932aa9f3625c4d8209960125b9332d4e08d' 
  AND token = 'nWF46co5NTp5gqG+I5lF1OBDuea04GWOUvYVJQOuiP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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