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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc97dc499698fe9ddfe8c2a292ac9608e3aeac131c8eba6642d6b1a442e2200' 
  AND token = 'iHW7KzNkbrIn/rTQlU24EB/pb6EMc7vNSXs3/CavXUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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