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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68ccce28d815f07342ca2b9b46cab7aff12b537ee609b08be4f8eb1832ef09d' 
  AND token = 'OfvH7UVhdOko9KCO+CD6fihrgprm59rIh9/8oyqC9to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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