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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a159125bc4c70a7597fb49b23e00ac3fb820b12fdb7dfff40d56a8dbffa611b7' 
  AND token = 'b8Boruklfxi5OyyLt+ZNDQvsnp9bZe/r9DijI0bPrd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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