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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4ac2af9fe0c0cc1eaf0e06733141c52f2a8beb99247f965d9696d82138b090' 
  AND token = 'x7u5/8ThJLOCH6xP+HC9loXOaD3liSoM4snA7J+fyNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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