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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf0657ca333d260a6c7217fae7b436710193addfdd1f42ee7f5244fe02634a6' 
  AND token = '3/d7d0vD9Hz0+EK2chx5QAOp17PtiC4k7i1Y432pIkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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