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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff2e5a3ddd15cfcb6bf4ed692ba37edb8597e3f0345a976111ab38bb94613ed' 
  AND token = 'jj2/z+x8Em9M9qCyI5OcLqNHim6wvkvKn4C1/L8bcbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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