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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b732c4eef64cab310a208b44b21e0eef93f6c8a1d81c4ec83afb785050ecdf' 
  AND token = 'St3ya7ok39Rq4kxo5BBD2Uf9LFe0m5X6gnSfnEOOlxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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