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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb8f3161ccb23918ad8b39e385d6e0dab831242f1dc5470114d8f6fa31f8800' 
  AND token = 'KYzdk6BEeXy9nNSB68DIbODZt3YUPFt51GPNBFGUFJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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