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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b67806db5765c62366a29e3786947d17d15ba63f701463eed3e4d60ae9b5979' 
  AND token = 'ReuzBti+3SkQVjjSDIQ1+S+H7Tg3IBvrwCNZLHsWazE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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