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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f79135ee48925ccf69d66feda1b04d7e321bd87ce943589e34f07bdad98a55' 
  AND token = '3gyCJWl+y/oAnpQr11bdU7Y51Ya5tbW9C6yc0vnF/hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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