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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6473cf840a72d02da52eb6aa3fb00b84da4c4d52921a2367280784d10ba1c4b1' 
  AND token = '0ck5/cxEzCFwX0S14Ow7Yn0TSEwVR8EpYyqJG/5UYxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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