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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6820d10d904636659ee1a0fa37d7f230cc7cb1705098800004b8b1b5e7cc13' 
  AND token = '/ym+Ii1TKUGnHwFDNvzPW1P8nRW6smrME0VMeZJG0a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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