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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdfb26b159f95fb00e6474b2dbaa641a607f8b4e0ee3dc017943071408a812c' 
  AND token = 'Nb0zX81AaNYSV1E4o+9nzAw6MZ3OfitFi+0/Z5or6gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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