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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d738e2ad58219cd5b71dc3575395db9dd3232693d671a5061d80a8154d9612' 
  AND token = 'wkiUl4tNKZNHBPqjPJy5JX/3dr1GAgEngZIL5QCIFPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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