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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11f1f4a91874a8fc06c0646b4cd7695a62d6c95f83894e9c9faa11dff04375a' 
  AND token = '9QT6T3JxipbVuoNRbBxtl+SlAYFhPsubo4IEhlU4cJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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