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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56464dd45e78b9745c48294c5455a2bd468fefa967f1084a912b1f3d74a9c474' 
  AND token = '8InAfDpOz1M0OouUGZVDRK4mVtEsf0x1MpTD7KmN0N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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