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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7970d3b3705bbb9f0b7bb9b4c507ad8d7ec54e39fd0513ee1ea1017509d1ba47' 
  AND token = '/k4f2eJ176Dix/7OUti059dsITrPOdbcIBUQpEEarTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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